| --- |
| layout: global |
| title: Nan Semantics |
| displayTitle: NaN Semantics |
| license: | |
| Licensed to the Apache Software Foundation (ASF) under one or more |
| contributor license agreements. See the NOTICE file distributed with |
| this work for additional information regarding copyright ownership. |
| The ASF licenses this file to You under the Apache License, Version 2.0 |
| (the "License"); you may not use this file except in compliance with |
| the License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| --- |
| |
| There is specially handling for not-a-number (NaN) when dealing with `float` or `double` types that |
| does not exactly match standard floating point semantics. |
| Specifically: |
| |
| - NaN = NaN returns true. |
| - In aggregations, all NaN values are grouped together. |
| - NaN is treated as a normal value in join keys. |
| - NaN values go last when in ascending order, larger than any other numeric value. |
